// 两个浮点数求和
export function accAdd(num1, num2) {
  let r1, r2
  try {
    r1 = num1.toString().split('.')[1].length
  } catch (e) {
    r1 = 0
  }
  try {
    r2 = num2.toString().split('.')[1].length
  } catch (e) {
    r2 = 0
  }
  const m = Math.pow(10, Math.max(r1, r2))
  return Math.round(num1 * m + num2 * m) / m
}

// 两个浮点数相减
export function accSub(num1, num2) {
  let r1, r2
  try {
    r1 = num1.toString().split('.')[1].length
  } catch (e) {
    r1 = 0
  }
  try {
    r2 = num2.toString().split('.')[1].length
  } catch (e) {
    r2 = 0
  }
  const m = Math.pow(10, Math.max(r1, r2))
  const n = (r1 >= r2) ? r1 : r2
  return (Math.round(num1 * m - num2 * m) / m).toFixed(n)
}

// 两数相除
export function accDiv(num1, num2) {
  let t1 = 0
  let t2 = 0
  try { t1 = num1.toString().split('.')[1].length } catch (e){}
  try { t2 = num2.toString().split('.')[1].length } catch (e){}
  const r1 = Number(num1.toString().replace('.', ''))
  const r2 = Number(num2.toString().replace('.', ''))
  return (r1 / r2) * Math.pow(10, t2 - t1)
}

// 两数相乘
export function accMul(num1, num2) {
  let m = 0
  const s1 = num1.toString()
  const s2 = num2.toString()
  try { m += s1.split('.')[1].length } catch (e) {}
  try { m += s2.split('.')[1].length } catch (e) {}
  return Number(s1.replace('.', '')) * Number(s2.replace('.', '')) / Math.pow(10, m)
}

// 四舍五入
export function roundFix(value, num) {
  if (num === 0) {
    return Math.round(value)
  }
  value = accMul(value, Math.pow(10, num))
  value = Math.round(value)
  value = accDiv(value, Math.pow(10, num))
  return value
}
